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Arnulf of Montgomery , magnate

Born: c. 1066 Died: 1118x1122

The youngest son of Roger de Montgomery, vicomte of the Hièmois in Normandy and earl of Shrewsbury, and brother of Hugh of Montgomery (earl of Shrewsbury) and Robert of Belleme, Arnulf was established at Pembroke where he built a castle. His years of royal service ended when he joined Robert's rebellion against the king in 1102; he was later reconciled to the king.

Arnulf gave the chapel St Nicholas in Pembroke Castle to his family foundation of St Martin-de-Séez, Normandy. In the late 1090s, he acquired the title of earl together with lands in Holderness. In 1101 Arnulf acted as a surety for Henry I in the treaty of Dover. However, the following year he joined his brother, Robert of Belleme, in rebellion against the king and later opposed Robert Curthose in Normandy. Arnulf led the first Norman campaign in Ireland against the Norse invaders and successfully defeated Magnus Bareleg.